Blood biomarkers in male and female participants after an Ironman-distance triathlon A Swedish group has studied what happens with biomarkers regarding possible damage to heart, liver, kidney and muscle during an Ironman triathlon.
For men, there was a significantly higher increase in myoglobin, CK and creatinine than women. The authors concluded that women better tolerate an endurance burden like an Ironman triathlon than men. The study can be found under https://pubmed.ncbi.nlm.nih.gov/28609447/